Sound-post mounting for phonographs.



J. G. NOLEN. SOUND POST MOUNTING FOR PHONOGRAPHS.

APPLICATION FILED JUNE 28. I916- Patenfed Oct. 9,1917.

, [71072723277 (Ema 5 61/702671,

O p I mounting comprising a threaded diaphragm frame 1 which contains therein the usual- 1 mica diaphragm 2, and attached thereto, 1I1

J'AMES G.- NOLEN, 05? NEW 1&

'SQWD-POST MOUNTIEG- FQR PHGHQGEQSEES.

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Application filed June as, ion-s. Serial so. ioaaes.

To'all whom it may mam; Be it known thatzl, JAMES G. .NOLEN, a citizen of the United States, residing and useful Improvements in. 'Sound Post Mountings for Phonographs, of which the following .is a specification.

My present invention relates to an nn-' provement in sound boxes and like sound producing devices, and has for its object to provide a rigid, tension'ed and. substantially frictionless stylus bar mounting therefor which-may be adjustable forwear is self centering and insures a true axial rotation. about the pivotal point of such stylus bar without end or side-playthereoficthereby counteracting the so called needling, and

'blastin sounds. of various'kinds that occur owing to looseness, of the pivots n their trunnions, thereby improving the" clarity of tone produoedtherefrom.

The tion is that it permits of true transmission of the wave oscillations imparted to the needle, through the stylus bar and sound post to the diaphragm without any loss due. to improperly fitted or worn trunnionswhich permit of considerable play, and

therefore, owing to the ratios'of arm lengths the lossIof/considerable diaphragm move: ment, and therefore reduce the volume ot tone. as well as mufiiing enunciationof' spoken parts and songs-.

In the accompanying drawings, Figure 1 is a front elevation of my device; Fig.2 is a.

side elevation thereof.

Fig. 3 is an enlarged sectional View of one of the trunnions.

Fig. 4 is another sectional'view 'thereo Fig. 5 shows an enlarged end portionv of the pivot. v Fig. 6' is a diagrammatic view showing certain principlesinvolved therein.

In Fig. 1 there isshowna diaphragm the customary manner, is a sound-post 3 s'pecificationof Letters Eatent.

."sion 5 which'is substantially an. cit-t in New York, in the county of New-York and State of New York, have invented certain new .berl is aimportant' advantage of my construe} surface of which however being. sligh 'concave'in order to permit its rat'e'iaeea'oee. e. lag;

s gn. of the sound-post and stylus; bar 4,,and having a needle -6 held 'aflixedthe'r'einxby' means of the'us'ua'l thumbnutfl; Soffarf the construction set forth" i's'substanti thereto, said stylus bar" 4; having standard.-' I .o Arranged at one side of tlie -frame'mefmg pair of ntegral, down. standing -,60 the usual manner asindicatedinFig. 3',ito

lugs 8 and 9 which'lugs are threadedfinfreceive thereinlan adjustable threaded'pi-vot member 10. There is also shown inFigQ-B Which i's'a sectional view-of the lug 9 taken 4 on line 3'-3..l ooking. in the direction ofthe arrows, in additiontothe-pivotal member 10, a lock nut-.11, which permitsof lockingv the'p vot members 10 after. they have been adjusted, with a screw" driver; by me'ans of the slotl2 in one'end thereof. By'referring to Fig. 5,- which is an enlarged fragmental view 01 the pivotal member 10; it will be noted that the trunnion end 13 thereof is. pointed orsubstantially cone. shaped, t'

with the faces of'the steel balls 14 which fare,

arrangedin-the chambered endl5 of the" *sound post stylusbar' 4 and-Which chainb'ered portion 15, as indicated in Fig-4g": is onlylarge enough to permitoi the introduction of said steel balls, without any play;

thereby insuring contacts between the balls themselves, between the outer. peripheries thereof and thooutside edge or wall of the The chamber 14 is sufficiently recessed-to permit the introduction of the balls 'to 'anyf desired depth and at the same timepermit-- ting the balls to hive con-tact with the back. wall 16 thereof. as indicated in Fig. 3, and

it is obvious that anyipressures' exercised upon the balls-by the convex conical point .13 of one'pivot member 10 is transmitted to a engagement" with said balls, the interstices around sald sures rigid coaxial alinement between the opposite opposed hearings on the diaphragm frame and wh ch are generally denoted by B and C.

As a further means for counteracting any probable oscillation of the bearing members, the recess chamber 15 is filled with a suitable resilient vibration absorbing material .17,

as isindicated in Figs. 3 and'ahwhich material 1n the present instance, may be of pure Para rubber suitably vulcanized therein, although any like materialmay be used.

' It is obvious that an opening must be leftin the vibration-absorbing material of sulfi-v cient diameter to permit the introductionthcrein of the pivotal members 1'0l0 so that they may have a clean metal to metal contactwith the steel balls, but all of the re-- maining interstices should be filled with the compound, thereby forming a compounded bearing of non-yielding and yielding material combined, the said non-yielding material forming non-compressible and stress assuming supports and the other material being a vibration non-conductor,

4 The steel balls and the convex trunnion point 13 should be hardened and highly pol -ished. While I have shown the pivotal '30 points to be convex, so as to assume a surface line contact with the faces of the balls, I may also make the surface of said cone straight, or concave, whereby a point contact only is made, as I have discovered that very little difference is made so long as the point is substantially cone shaped, thereb y forming an expanding means for creating opposing tension between the balls.

I claim:

1. A stylus bar mountingfor phonograph sound boxes comprising supports carried by the sound box, a stylus bar pivotally mounted between said supports, needle holding -means and a sound post carried by the stylus bar, the said stylus bar having recessed chambers on its ends, a plurality of steel .balls therein, adjustable cone pivots carried by said supports the'cone ends thereof being in contact with said steel balls,' and locking means for locking said cone pointed pivots in rigid and operative connection with said balls,'the recess in which said balls are mounted being filled with a pure Para rubber. i a

2.- A stylus bar mounting for phonograph I sound boxes comprising supports thereon, a

stylus bar'mounted on said supports, a bearing between said stylus bar and the supports, 'said bearing com-prising a recess, steel balls set therein, pivotal members in engagement balls being filled with avibration absorbing material insane? three metal balls arranged in contact with each other and mounted in vibration absorbmg materlal, said balls and material being ing in contact with the said balls.

5. A. stylus bar mounting for phonograph sound boxes comprising supports carried by the sound 'box, the stylus bar having bearings therein, bearings comprising three metal balls mounted in vibration absorbing material and arranged in contact with each other, and convex conical pivots fitting within the space between the said balls.

6. A stylus bar mountingfor phonograph sound boxes comprising supportscarried by the sound-box, the stylus bar having bearings therein, bearings comprising three metal balls mounted in vibration absorbing 1 'material and arranged in contact with each other, and screw threaded. members adjusably mounted in the said supports and having convex conical ends fitting within the space between the said balls.

. 7. A stylusbar mounting for phonograph sound boxes comprising supports carried by the sound box, the stylus bar having bearings therein, bearings comprising three metal balls mounted in vibration absorbing material and arranged in contact with each other, and screw threaded members adjustably mounted in the'said supports and having convex conical ends fitting within the space between the said balls, said pivots llh adapted to be adjusted to lock the conical" convex ends thereof rigidly against the three.

balls. v

8. A stylus bar mounting for phonograph sound boxes comprising bearings between said sound box and the stylus bar, said bearings comprising metal pivots and contacting metal balls, said pivots in contact with said balls, and said balls mounted in vibration absorbing materiaL.

9. A stylus bar. mounting for: phonograph sound boxes comprising bearings between the said sound, box and the stylus bar, said I so carried by the stylus bar, the said pivots bebearings comprising metal pivots and contacting metal balls, said pivots in contact with said balls and said balls mounted in vibration absorbing material, and means for pivots in contact with said balls, said balls adjusting the p' ai-predetermined tension.- and means for adjusting the pivots against 10; A stylus bar mounting for phonothe said balls to .apredetermined tension.

5 graph sound boxes comprising bearings be- 4 JAMES G. NOLEN.

tween the-said sound box and the stylus bar, Witnesses: I said bearings comprising supports, contact-' HENRY I. SIEGE Iing metal balls wlthinj the supports, metal *HARoLn D.. PENNEY,

vots against the saidballs to mounted in vibration absorbing material,'1o 

